EP 3203086 A1 20170809 - HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE
Title (en)
HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE
Title (de)
HYDRAULIKKREIS FÜR BAUMASCHINE
Title (fr)
CIRCUIT HYDRAULIQUE DE MACHINE DE CONSTRUCTION
Publication
Application
Priority
- JP 2012136351 A 20120615
- EP 13804191 A 20130306
- JP 2013056194 W 20130306
Abstract (en)
A hydraulic circuit for a construction machine including a direction control valve group having multiple direction control valves that are provided in tandem to a center bypass passage of the construction machine, and a bleed-off valve provided to the center bypass passage downstream of the direction control valve group. The direction control valve includes a first internal passage that flows out pressure oil supplied to the direction control valve to the center bypass passage, and a second internal passage that supplies the pressure oil to a hydraulic actuator of the construction machine. The first internal passage causes pressure oil discharged from the hydraulic pump to flow out to the center bypass passage downstream of the direction control valve, so that the center bypass passage and the first internal passage form a parallel passage. The bleed-off valve performs bleed-off control on pressure oil supplied by way of the parallel passage by changing an opening area of the bleed-off valve.
IPC 8 full level
F15B 11/00 (2006.01); F15B 11/02 (2006.01); F15B 11/16 (2006.01)
CPC (source: EP KR US)
E02F 9/22 (2013.01 - KR); E02F 9/2228 (2013.01 - EP US); E02F 9/2267 (2013.01 - EP US); E02F 9/2282 (2013.01 - EP US); E02F 9/2285 (2013.01 - EP US); E02F 9/2292 (2013.01 - EP US); E02F 9/2296 (2013.01 - EP US); F15B 11/00 (2013.01 - KR); F15B 11/02 (2013.01 - US); F15B 11/16 (2013.01 - EP US); F15B 13/0402 (2013.01 - EP US); F15B 2211/20576 (2013.01 - EP US); F15B 2211/30525 (2013.01 - EP US); F15B 2211/30565 (2013.01 - EP US); F15B 2211/3116 (2013.01 - EP US); F15B 2211/31582 (2013.01 - EP US); F15B 2211/41554 (2013.01 - EP US); F15B 2211/45 (2013.01 - EP US); F15B 2211/7135 (2013.01 - EP US); F15B 2211/7142 (2013.01 - EP US); F15B 2211/78 (2013.01 - EP US); F15B 2211/781 (2013.01 - EP US)
Citation (search report)
- [A] EP 0533953 A1 19930331 - HITACHI CONSTRUCTION MACHINERY [JP]
- [A] EP 1811185 A2 20070725 - KOBELCO CONSTR MACHINERY LTD [JP]
- [AD] JP H11257302 A 19990921 - TOSHIBA MACHINE CO LTD
- [A] EP 1191234 A1 20020327 - HITACHI CONSTRUCTION MACHINERY [JP]
- [A] EP 1316650 A2 20030604 - KOBELCO CONSTR MACHINERY LTD [JP]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
US 2015059332 A1 20150305; US 9903097 B2 20180227; CN 104246234 A 20141224; CN 104246234 B 20170929; CN 107587548 A 20180116; CN 107587548 B 20210330; EP 2863066 A1 20150422; EP 2863066 A4 20151202; EP 2863066 B1 20170531; EP 3203086 A1 20170809; EP 3203086 B1 20181205; JP 2014001768 A 20140109; JP 5758348 B2 20150805; KR 101653364 B1 20160902; KR 101893072 B1 20180829; KR 20140138265 A 20141203; KR 20160103152 A 20160831; US 10443213 B2 20191015; US 2018002897 A1 20180104; WO 2013187091 A1 20131219
DOCDB simple family (application)
US 201414536776 A 20141110; CN 201380020041 A 20130306; CN 201710830987 A 20130306; EP 13804191 A 20130306; EP 17162921 A 20130306; JP 2012136351 A 20120615; JP 2013056194 W 20130306; KR 20147028303 A 20130306; KR 20167022610 A 20130306; US 201715686369 A 20170825